One of my favorite store bought is Fagundes Seasoning for beef, chicken, seafood ... I also use it instead of salt & pepper on eggs, salads, etc.
I have many wonderful rubs and seasonings that I developed in my new book but it wouldn't be fair for me to divulge their recipes.
However, one of the best homemade rubs of all time for chicken and pork is Jan's Original Dry Rub. It can make a brick taste great!!! Just search the site for the recipe ... it uses 13 ingredients.